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Y=<a href="%pathto:special.vl_dgaussian;">VL_DGAUSSIAN</a>(X) evaluates the derivative of the standard Gaussian
density.
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To obtain the Gaussian density of standard deviation S, do
</p><pre>
  Y = 1/S^2 * VL_DGAUSSIAN(X/S) .
</pre><p>
See also: <a href="%pathto:special.vl_gaussian;">VL_GAUSSIAN</a>(), <a href="%pathto:special.vl_ddgaussian;">VL_DDGAUSSIAN</a>(), <a href="%pathto:vl_help;">VL_HELP</a>().
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